GROWTH DEVELOPMENT CHILD
SUMMATIVE ASSESSMENT
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A cannon fires a cannon ball.
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A spoon is shoved into a jar of peanut butter.
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A linebacker tackles a member of the opposite team.
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A swimmer jumps off a floating raft.
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A figure skater throws a heavy ball.
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Detailed explanation-1: -An object being fired from a cannon is also a collision where momentum must be conserved. As the momentum before the ‘collision’ is zero, the momentum after the collision is zero. In physics, this type of event is termed an explosion.
Detailed explanation-2: -Explosion. An explosion is a special type of collision. It is a perfectly inelastic collision that seemingly happens in reverse. Before the ‘collision’, all objects are stuck together.
Detailed explanation-3: -If the cue ball strikes a stationary billiard ball straight on, then the cue ball will stop moving after the collision. It will have transferred all of its kinetic energy to the other ball, which will move forward with the same velocity that the cue ball had before the collision.
Detailed explanation-4: -When the man throws the ball, no external force is acting upon the system, so linear momentum must be conserved. Thus the man and boat must move in a direction opposite to the direction of travel of the ball. When thrown, the ball is given a linear momentum of p = mv = 10.